diff --git a/include/configs/incaip.h b/include/configs/incaip.h
index b17d7f3..99e7868 100644
--- a/include/configs/incaip.h
+++ b/include/configs/incaip.h
@@ -31,8 +31,10 @@
 #define CONFIG_MIPS32		1	/* MIPS 4Kc CPU core	*/
 #define CONFIG_INCA_IP		1	/* on a INCA-IP Board	*/
 
+#ifndef	CPU_CLOCK_RATE
 /* allowed values: 100000000, 133000000, and 150000000 */
 #define CPU_CLOCK_RATE	133000000	/* 133 MHz clock for the MIPS core */
+#endif
 
 #if CPU_CLOCK_RATE == 100000000
 #define INFINEON_EBU_BOOTCFG	0x20C4	/* CMULT = 4 for 100 MHz */